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Pi is the ratio of the circumference of a circle to it's diameter. However it's value is irrational. It is not an idea or tool that we created (we found/discovered it). But in 1897 the Indiana state legislature tried to pass a bill making pi equal to 3.2, 3.23 or 4, you could take your pick, LOL. I have often thought that if there is an intelligent designer of our universe that useful numbers like pi would be rational.
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